VMD5 series vacuum breaker is of indoor high voltage switchgear suitable for 40.5kV.

Three-phase power system with 50Hz frequency in order to protect and control electrical appliances, and especially suitable for frequent operation at rated current or incessant open circuit due to unique advantages of vacuum circuit breaker.

VMD5 series vacuum breaker can be used independently, and also can be applied in central switch cabinet, fixed switch cabinet, and oilless recon-struction, as well as realize complete interchangeability with foreign like products.

Please consult with manufacturer on manufacturing technology when operating environment is the climatic environment with high altitude, high humidity and great temperature change or other special environment condition.

3. Main specifications and technical parameters

NO

Item

Unit

Technical data

1

Rated voltage

KV

40.5

2

Rated insulating level

Rated short time power frequency withstandvoltage(1 min)

95

Rated lighting impulse withstand voltage

185

3

Rated Frequency

Hz

50/60

4

Rated current

A

630

630

1250

1250

1250

1600

2000

2500

5

Rated short circuit breaking current

KA

20

25

31.5

6

Rated short time withstand current

20

25

31.5

7

Rated peak withstand current

50

63

80

8

4S rated short-time withstand current

20

25

31.5

9

Rated peak value of current

50

63

80

10

Rated short-circuit making current(peak value)

50

63

80

11

Duration of rated short-circuit current

S

4

12

Mechanical endurance

times

10000,30000,60000

13

Rated making surge current of capacitor

KA

12.5(The frequency is less than 1000Hz)

14

Rated breaking current of single/symmetrical capacitor bank

A

630,400

15

Breaking times at rated short-circuit current

Times

20

16

Power frequency withstand voltage of secondary circuit

V

2000

17

Rated operating voltage

AC110/220

DC110/220

18

Rated operating order

O-0.3S-CO-180S-CO

19

Energy storage times

S

<=15

20

Clearance

mm

202

21

Travel

61

22

Pole distance

3001.5

23

Bounce time(making)

ms

<=3

24

Three pole making/breaking non simultaneity

<=2

25

Average breaking time

m/s

1.5~1.9

26

Average making time

0.6~1.3

27

Making time

ms

30-80

28

Breaking time

20-45

29

Contact pumping(breaking)

mm

<=3

Packaging, transportation and storage precautions

(1) Circuit breaker should be in the state of opening and energy storage spring in a state without energy storage when packing. It should be in the state of opening and energy storage spring in a state without energy storage when packing. And it should be fixed on the bottom of the wooden case, should have waterproof measures and complete package labels.(2) Circuit breakers can't invert and avoid strong vibration, rain, surface damage, and components lost when transportation.(3) When loading the circuit breaker, we suggest the following tools: crane, forklift and driving. When lifting the circuit breaker, we should not hook on the body or pole of the circuit breaker, but on the lifting hole which has the lifting mark.(4) When circuit breaker has a long-term storage, it should be in a state of opening and energy storage spring in a state without energy storage and placed in dry ventilated indoor preventing from moisture, vibration control and harmful gas erosion, and regularly checked whether environment meets the requirements.(5)When first use products after long-term storage, it need to have a power frequency withstand voltage insulation testing.